Process for producing a riveted joint by forming a rivet head onto a heated rivet pin using a riveting tool

Abstract

The invention relates to a process for producing a riveted joint using a riveting tool. The essential feature is that a pin-shaped blank of a recrystallized, coarse-grained iron-based or nickel-based ODS superalloy having a grain elongation in the longitudinal direction of 5:1 to 50:1 is used for the rivets. The production of the rivet heads is performed under defined process temperatures, at a pin temperature between 600° and 1000° C. and at a tool temperature between 50° and 300° C.

We claim: 
     
       1. A process for producing a riveted joint between a plurality of components, each component including a hole therethrough, said process comprising: providing a rivet pin with a preformed head on one end thereof, said rivet pin consisting of a recrystallized, coarse-crystalline, iron-based or nickel-based oxide dispersion strengthened superalloy having grain elongation in the longitudinal direction in the range of 5:1 to 50:1;   orienting said components such that the holes in the components are axially aligned;   inserting said headed rivet pin through said aligned holes such that a portion of said pin opposite said one end projects from said aligned holes;   heating said rivet pin to a temperature between 600 and 1000 degrees C.;   heating a riveting tool to a temperature between 50 and 300 degrees C.;   shaping said projecting portion of said heated rivet pin with said heated riveting tool to form a deformed rivet head, thereby capturing said components between said preformed head and said deformed head.   
     
     
       2. A process for producing a riveted joint as claimed in claim 1, wherein at least one of said components consists of an iron-based or nickel-based oxide dispersion strengthened superalloy. 
     
     
       3. A process for producing a riveted joint as claimed in claim 2, wherein the shaping of the projecting portion of the heated rivet pin is performed at a pin temperature between 750 and 850 degrees C. 
     
     
       4. The process for producing a riveted joint as claimed in claim 3, wherein the tool temperature is between 200 and 300 degrees C. 
     
     
       5. The process for producing a riveted joint as claimed in claim 2, wherein the tool temperature is between 200 and 300 degrees C. 
     
     
       6. A process for producing a riveted joint as claimed in claim 1, wherein the shaping of the projecting portion of the heated rivet pin is performed at a pin temperature between 750 and 850 degrees C. 
     
     
       7. The process for producing a riveted joint as claimed in claim 6, wherein the tool temperature is between 200 and 300 degrees C. 
     
     
       8. The process for producing a riveted joint as claimed in claim 1, wherein the tool temperature is between 200 and 300 degrees C. 
     
     
       9. The process for providing a rivet joint as claimed in claim 1, wherein said rivet pin with said preformed head is formed from said superalloy having a pinshape, by heating said pinshaped superalloy to a temperature between 600 and 1000 degrees C., heating a riveting tool to a temperature between 50 and 300 degrees C. and shaping one end of said heated pinshaped superalloy with said heated riveting tool to form said preformed head.